背景是1914年初的第一次世界大战，《德国国王》改编自喀麦隆王子鲁道夫·杜阿拉·曼加·贝尔的真实故事，他从小在德国长大。父亲去世后，他回到喀麦隆的家中，继承王位。然而，回到非洲的家乡后，他了解到，在威廉二世的暴虐殖民统治下，人民惨遭压迫和杀害。他意识到，结束苦难的唯一途径是带领人民反抗威廉二世的统治，这个他曾经被视为兄弟和密友的人。

Set in 1914 at the start of World War I, The German King is the incredible true story of Rudolf Douala Manga Bell; a Cameroonian Prince who was raised in Germany. After his father’s death he returns home to Cameroon to become King. However once back home in Africa, he learns that his people are being oppressed and killed under Kaiser Wilhelm II’s tyrannical colonial rule. He realizes the only way to put an end to his nation’s suffering, is to lead his people in a rebellion against the Kaiser; a man he once considered his brother and best friend.